激光显示用荧光材料的研究

发布时间：2018-04-25 07:35

本文选题：激光显示 + 荧光材料　；参考：《山东大学》2017年硕士论文

【摘要】：激光显示作为新一代的显示技术,其优异的显示性能引起了科研和生产领域极大的关注,然而因为其存在低安全性、高成本以及干涉散斑噪声等缺点,所以仍未达到全面应用的标准。激光激发荧光粉显示技术主要利用单色激光激发荧光色轮以产生其它光线并最终经过混合得到所需光源。该技术不仅解决了激光消散斑问题,在寿命、可靠性与安全性上,继承了传统半导体光源的优势,而且降低了激光光源成本。因此,该技术有望作为激光显示的改进技术并最终得到广泛的应用。当前对于激光显示领域蓝光激发荧光材料的研究较为匮乏,因此,获得在蓝色激光激发下发光效率高、稳定性好、荧光寿命较短、耐高温的荧光材料将成为加快激光显示发展和普及的关键。本文主要的工作内容如下:1.首先针对已存在的代表性荧光粉材料进行了一系列的表征。利用X射线光电子能谱分析仪和X射线衍射仪对其进行了元素构成及物相结构方面的分析。利用扫描电子显微镜表征获得荧光粉材料的微观形貌,包括粒子尺寸、粒子均匀性等。利用光致发光光谱仪、荧光光度计等测试手段表征了荧光粉材料的光学性能,包括激发与发射光谱、量子产率及荧光寿命等。2.利用具备优异光学性能的荧光粉材料通过高温反应得到致密化的荧光陶瓷材料,以获得更好的光学及力学性能。本文对蓝色激光激发的荧光陶瓷材料的制备工艺进行了研究。在样品坯体合成过程中,通过改变添加剂的种类及质量分数,压片方式及压力大小等因素探究其分别对荧光陶瓷材料烧结致密化程度的影响,并分析产生影响的工作机制。在样品高温烧制过程中,通过改变最高保温温度,升降温速率及保温时间等因素探究其分别对荧光陶瓷材料烧结致密化程度的影响,并从微观粒子角度,分析了荧光粉颗粒在反应过程中的变化,解释了烧结条件对陶瓷材料致密化甚至其光学性能产生影响的微观机理。根据实验结果分析,得出结论:(1)为使荧光陶瓷材料达到最佳致密化程度,在原料混合过程中,根据荧光粉原料的不同,所加入添加剂的含量存在一个最佳质量分数。(2)在坯体压制成型过程中,压力大小及保压时间均存在一个最佳值,最有利于样品充分致密化。(3)样品烧结过程中,相对于保温时间的延长,提高保温温度对于促进陶瓷致密化的影响更大,保温时间的延长可能会引起晶粒的异常长大,反而降低荧光强度和发光效率。3.本文对合成荧光陶瓷材料进行了结构上表征测试,主要包括基质及稀土元素种类构成、物相结构、微观形貌等。另外,还对其光学性能进行了一定程度上的表征,包括材料透光率、发射光谱及量子产率等。探究了荧光陶瓷成分构成、微观形貌对其光学性能产生的影响及影响机理。通过比较荧光粉粉末材料与荧光陶瓷材料的光学性能,可以得出,相同的成分构成条件下,结构上的致密化会大幅提高荧光材料的发光强度,而且一定程度上提高了材料的发光效率。
[Abstract]:Laser display as a new generation of display technology, its excellent display performance has aroused great concern in the field of scientific research and production. However, because of its low security, high cost and interference speckle noise, the laser display technology has not reached the standard of full application. The laser excitation fluorescence powder display technology mainly uses monochromatic laser to stimulate fluorescence. This technology not only solves the problem of laser dispersing spots, but also inherits the advantages of traditional semiconductor light source in life, reliability and safety, and reduces the cost of laser light source. Therefore, this technology is expected to be an improved technique for laser display and is eventually widely used. At present, the research on blue light excited fluorescence materials in the field of laser display is scarce. Therefore, high luminescence efficiency, good stability and short fluorescent life are obtained under the excitation of blue laser. High temperature resistant fluorescent materials will become the key to speed up the development and popularization of laser display. The main contents of this paper are as follows: 1. first of all, it is aimed at already The existing representative phosphor materials were characterized by a series of characterization. The structure and phase structure of the elements were analyzed by X ray photoelectron spectroscopy and X ray diffractometer. The microscopic morphology of the phosphor material was characterized by scanning electron microscope, including particle size, particle uniformity and so on. The optical properties of the phosphor materials were characterized by optical spectrometer and fluorometer, including the excitation and emission spectra, the quantum yield and the fluorescence lifetime. The.2. with excellent optical properties was used to obtain the compact fluorescent ceramics by the high temperature reaction to obtain better optical and mechanical properties. The preparation process of fluorescent ceramic materials excited by color laser is studied. In the process of sample billet synthesis, the influence of the type and mass fraction of the additive, the pressing mode and the size of pressure on the densification degree of the sintered ceramic materials are investigated, and the working mechanism of the influence is analyzed. In the process of burning, the influence of the maximum heat preservation temperature, the temperature and temperature rate and the heat preservation time on the densification of the sintered ceramic materials was investigated. The changes in the reaction process were analyzed from the microscopic particle angle, and the densification of the ceramic materials and even the optical properties of the ceramic materials were explained. According to the analysis of the experimental results, it is concluded that (1) in order to make the best densification of the fluorescent ceramic material, in the process of mixing raw materials, according to the different materials of the phosphor powder, the content of the additive has an optimum mass fraction. (2) the pressure size and the pressure holding time are all stored in the process of forming the blank body. At an optimal value, it is the best densification of the sample. (3) in the process of sintering, the effect of increasing the heat preservation temperature on the densification of the ceramics is greater than that of the heat preservation time. The prolongation of the heat preservation time may cause abnormal growth of the grain, but the fluorescence intensity and the luminous efficiency of.3. are reduced to the synthetic fluorescent ceramics. The material was characterized by structural characterization, including the composition of matrix and rare earth elements, phase structure and Micromorphology. In addition, the optical properties of the materials were also characterized, including the transmittance, emission spectra and quantum yields of the materials. The composition of the fluorescent ceramics was explored and the optical properties of the micromorphology were produced. By comparing the optical properties of phosphor powder materials and fluorescent ceramic materials, it can be concluded that under the same composition conditions, the densification of the structure will greatly increase the luminescence intensity of the fluorescent material and improve the efficiency of the material to a certain extent.

【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN104.3

【参考文献】